docs: def CreateMuskingumXFileFromDranageLine(in_drainage_line,
                                          x_id,
                                          out_x_file,
                                          file_geodatabase=None):
      """
      Create muskingum X file from drainage line.
  
      Parameters
      ----------
      in_drainage_line: str
          Path to the stream network (i.e. Drainage Line) shapefile.
      x_id: str
          The name of the muksingum X field (i.e. 'Musk_x').
      out_x_file: str
          The path to the output x file.
      file_geodatabase: str, optional
          Path to the file geodatabase. If you use this option,
          in_drainage_line is the name of the stream network feature class
          (WARNING: Not always stable with GDAL).
  
  
      Example::
  
          from RAPIDpy.gis.muskingum import CreateMuskingumXFileFromDranageLine
  
          CreateMuskingumXFileFromDranageLine(
              in_drainage_line='/path/to/drainageline.shp',
              x_id='Musk_x',
              out_x_file='/path/to/x.csv')
  
      """
      ogr_drainage_line_shapefile_lyr, ogr_drainage_line_shapefile = \
          open_shapefile(in_drainage_line, file_geodatabase)
  
      with open_csv(out_x_file, 'w') as kfile:
          x_writer = csv_writer(kfile)
          for drainage_line_feature in ogr_drainage_line_shapefile_lyr:
              x_writer.writerow([drainage_line_feature.GetField(x_id)])
  
      del ogr_drainage_line_shapefile